maybe control- F in the guide to check after crystal flower?
You can get one in :Hundred Hole Cave / Basilisk Mountain also i think.
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To clarify, yes, it’s possible to find a Crystal Flower at Hundred Hole Cave in Mt. Guido. However, you have to read the relevant book at Achstan’s library first, which requires an A-Rank Hanger License and finishing Gore’s quest to access the area beyond Acquia. Basilisk Mountain is another option, but it’s only available very late in the game.